Introduction
This demo will show you how to record eye-tracking data while your participant fixates on a stationary target.
Prerequisites
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LabMaestro is installed and activated.
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An eye-tracking device (e.g., TRACKPixx3) is connected to your computer via an I/O hub (e.g., DATAPixx3).
Project Files
Step 1 - Add your TRACKPixx to the Project and Wake it
First, after opening LabMaestro, go to the Project tab, under Environment. Right-click on your TRACKPixx device to add it to your project. You can then use the Wake TRACKPixx command in the top menu bar to start your device.
For more details on setting up a TRACKPixx3 with LabMaestro, see TRACKPixx3 Eye Tracker.
Step 2 - Calibrate your TRACKPixx
By clicking Configure TRACKPixx in the top menu bar, you will be prompted to set up your tracker as needed. We recommend using the Find Optimal Settings option to quickly define search limits and the expected iris size. You can then run a calibration to ensure your tracker is properly following eye position on your display.
For a more detailed explanation of the calibration steps, please see Calibration with TRACKPixx3.
Step 3 - Use the Tracker Object to Estimate Eye Position
Define a region (e.g., a pink circle) that indicates where your participant is looking. You can define its horizontal position as Tracker.gazex and its vertical position as Tracker.gazey, in pixels. These values are updated in real time while LabMaestro is running and provide an estimate of eye position averaged across both eyes. These measurements are not as precise as those recorded for data analysis, but they provide a sufficiently precise estimate for gaze-contingent experiments.
In the accompanying demo, a pink circular region follows the participant’s gaze across a 9-by-3 grid of dots.
Related Links
Controlling Experiment Flow using the TRACKPixx3